router.addRoutes(routes: Array<RouteConfig>)

const router = new Router({
  routes: [
    {
      path: '/login',
      name: 'login',
      component: () => import('../components/Login.vue')
    },
    {path: '/', redirect: '/home'},
  ]  
})

const router = new Router({
  routes: [
    {path: '/', redirect: '/home'},
  ]  
})

router.addRoutes([
  {
    path: '/login',
    name: 'login',
    component: () => import('../components/Login.vue')
  }
])

{path: '*', redirect: '/404'}

// 左侧菜单栏数据
menuItems: [
  {
    name: 'home', // 要跳转的路由名称 不是路径
    size: 18, // icon大小
    type: 'md-home', // icon类型
    text: '主页' // 文本内容
  },
  {
    text: '二级菜单',
    type: 'ios-paper',
    children: [
      {
        type: 'ios-grid',
        name: 't1',
        text: '表格'
      },
      {
        text: '三级菜单',
        type: 'ios-paper',
        children: [
          {
            type: 'ios-notifications-outline',
            name: 'msg',
            text: '查看消息'
          },
          {
            type: 'md-lock',
            name: 'password',
            text: '修改密码'
          },
          {
            type: 'md-person',
            name: 'userinfo',
            text: '基本资料',
          }
        ]
      }
    ]
  }
]

<!-- 菜单栏 -->
<Menu ref="asideMenu" theme="dark" width="100%" @on-select="gotoPage" 
accordion :open-names="openMenus" :active-name="currentPage" @on-open-change="menuChange">
  <!-- 动态菜单 -->
  <div v-for="(item, index) in menuItems" :key="index">
    <Submenu v-if="item.children" :name="index">
      <template slot="title">
        <Icon :size="item.size" :type="item.type"/>
        <span v-show="isShowAsideTitle">{{item.text}}</span>
      </template>
      <div v-for="(subItem, i) in item.children" :key="index + i">
        <Submenu v-if="subItem.children" :name="index + '-' + i">
          <template slot="title">
            <Icon :size="subItem.size" :type="subItem.type"/>
            <span v-show="isShowAsideTitle">{{subItem.text}}</span>
          </template>
          <MenuItem class="menu-level-3" v-for="(threeItem, k) in subItem.children" :name="threeItem.name" :key="index + i + k">
            <Icon :size="threeItem.size" :type="threeItem.type"/>
            <span v-show="isShowAsideTitle">{{threeItem.text}}</span>
          </MenuItem>
        </Submenu>
        <MenuItem v-else v-show="isShowAsideTitle" :name="subItem.name">
          <Icon :size="subItem.size" :type="subItem.type"/>
          <span v-show="isShowAsideTitle">{{subItem.text}}</span>
        </MenuItem>
      </div>
    </Submenu>
    <MenuItem v-else :name="item.name">
      <Icon :size="item.size" :type="item.type" />
      <span v-show="isShowAsideTitle">{{item.text}}</span>
    </MenuItem>
  </div>
</Menu>

const asyncRoutes = {
  'home': {
    path: 'home',
    name: 'home',
    component: () => import('../views/Home.vue')
  },
  't1': {
    path: 't1',
    name: 't1',
    component: () => import('../views/T1.vue')
  },
  'password': {
    path: 'password',
    name: 'password',
    component: () => import('../views/Password.vue')
  },
  'msg': {
    path: 'msg',
    name: 'msg',
    component: () => import('../views/Msg.vue')
  },
  'userinfo': {
    path: 'userinfo',
    name: 'userinfo',
    component: () => import('../views/UserInfo.vue')
  }
}

// 传入后台数据 生成路由表
menusToRoutes(menusData)

// 将菜单信息转成对应的路由信息 动态添加
function menusToRoutes(data) {
  const result = []
  const children = []

  result.push({
    path: '/',
    component: () => import('../components/Index.vue'),
    children,
  })

  data.forEach(item => {
    generateRoutes(children, item)
  })

  children.push({
    path: 'error',
    name: 'error',
    component: () => import('../components/Error.vue')
  })

  // 最后添加404页面 否则会在登陆成功后跳到404页面
  result.push(
    {path: '*', redirect: '/error'},
  )

  return result
}

function generateRoutes(children, item) {
  if (item.name) {
    children.push(asyncRoutes[item.name])
  } else if (item.children) {
    item.children.forEach(e => {
      generateRoutes(children, e)
    })
  }
}